Long fiber reinforced plastic composite material and method for manufacturing long fiber reinforced plastic composite material

Abstract

Provided is a long fiber reinforced plastic composite material comprising: a thermoplastic plastic resin; and long fibers dispersed so as to have unidirectional orientation, wherein the content of the unidirectionally oriented long fibers is 70 to 100% by weight in the total content of the long fibers.

1 . A long fiber reinforced plastic composite material, comprising: a thermoplastic plastic resin; and long fibers dispersed to have unidirectional orientation, wherein the content of the unidirectionally oriented long fibers is 70 to 100% by weight in the total content of the long fibers. 
     
     
         2 . The long fiber reinforced plastic composite material of  claim 1 , wherein the long fiber reinforced plastic composite material comprises the thermoplastic plastic resin as a matrix material, and the long fibers as a reinforcing material dispersed in the matrix material. 
     
     
         3 . The long fiber reinforced plastic composite material of  claim 1 , wherein the long fiber has a length of 1 mm to 100 mm. 
     
     
         4 . The long fiber reinforced plastic composite material of  claim 1 , wherein the long fibers have an average diameter of 5 μm to 20 μm. 
     
     
         5 . The long fiber reinforced plastic composite material of  claim 1 , wherein the long fibers haves a content of 40 wt % to 75 wt % of a total. 
     
     
         6 . The long fiber reinforced plastic composite material of  claim 1 , wherein the long fiber comprises at least one selected from the group consisting of glass fiber, carbon fiber, basalt fiber, aramid fiber, natural fiber, and combinations thereof. 
     
     
         7 . The long fiber reinforced plastic composite material of  claim 1 , wherein the thermoplastic plastic resin comprises at least one selected from the group consisting of polypropylene (PP), polyethylene (PE), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polyamide (PA), acrylonitrile-butadiene-styrene copolymer (ABS), polycarbonate (PC)-ABS alloy resin, and combinations thereof. 
     
     
         8 . The long fiber reinforced plastic composite material of  claim 1 , wherein the long fiber reinforced plastic composite material is a sheet having a thickness of 0.2 mm to 10 mm. 
     
     
         9 . A method for manufacturing a long fiber reinforced plastic composite material, comprising:
 preparing a unidirectional continuous fiber reinforced plastic sheet comprising a thermoplastic plastic resin and continuous fibers dispersed to have a unidirectional orientation; and   cutting the continuous fibers in the unidirectional continuous fiber reinforced plastic sheet by applying an impact to the continuous fibers having the unidirectional orientation from the outside to form long fibers;   wherein the content of the unidirectionally oriented long fibers is 70 to 100% by weight of the total content of the long fibers.   
     
     
         10 . The method for manufacturing a long fiber reinforced plastic composite material of  claim 9 , wherein a linear impact is applied to a continuous fiber reinforced plastic sheet, which is extrusion-molded, discharged from an extruder, and moves in a predetermined direction, using a device equipped with a line impact part which can apply a linear impact in a width direction perpendicular to a moving direction of the continuous fiber reinforced plastic sheet. 
     
     
         11 . The method for manufacturing a long fiber reinforced plastic composite material of  claim 10 , wherein the line impact part moves up and down reciprocally, and when the line impact part comes to a lower position, a linear impact is applied to the continuous fiber reinforced plastic sheet, and the duration of time of up and down movement is controlled to thereby adjust the length of the long fibers formed by cutting the continuous fibers. 
     
     
         12 . The method for manufacturing a long fiber reinforced plastic composite material of  claim 11 , wherein the long fibers having a constant length are formed by controlling the up and down movement of the line impact part at a constant speed. 
     
     
         13 . The method for manufacturing a long fiber reinforced plastic composite material of  claim 9 , wherein the step of preparing a unidirectional continuous fiber reinforced plastic sheet is carried out by a long fiber thermoplastic-direct (LFT-D) process.